ANTARCTIC BENTHOS
Bivalvia
99
Yoldia (Aequiyoldia) eightsi
Propeleda longicaudata
Silicula rouchi
Malletia Sabrina
Limopsis lilliei
L. marionensis
Philobrya sublaevis
Adacnarca nitens
Lissarca notorcadensis
Adamussium colbecki
Limatula hodgsoni
Cyclocardia astartoides
Pseudokellya cardiformis (Smith)
Cyamiocardium denticulatum (Smith)
Mysella miniuscula (Pfeffer)
Thracia meridionalis
Laternula elliptica
Cuspidaria tenella
Scaphopoda
CaduEus dalli antarcticus
Dentalium ( Fissidentalium) majorinum
Gastropoda
Lepeta coppingeri (Smith)
Capulua subcompressus Pelseneer
Subonoba fraudulenta (Smith)
Amauropsis (Kerguelenutica) grisea
Neobuccinum eatoni
Many other gastropods have a circumpolar distribution but do not
seem t o be commonly encountered in any one area. In some genera
there are a range of closely allied species and one or other species of
Prosipho , Cerit hiopsilla , Margar ella, Ovirissoa , Subonova, A mauropsis ,
Trophon and Toledonia are likely to occur in most assemblages.
The writer (Dell, 1968) has commented on the number of Antarctic
shelf Mollusca which have wide bathymetric ranges, a total of 48 species
having ranges greater than 500 m, five with ranges greater than 1 000m.
With a few exceptions these species with wide bathymetric ranges
include those which make up the most widespread, commonly en-